Speckle Reduction for Ultrasonic Imaging Using Frequency Compounding and Despeckling Filters along with Coded Excitation and Pulse Compression

Table 1

CNR, HO, 𝐻_diff, and cSNR for the 30 cases of simulated RF data for a 15 mm target.¹

Technique^2	CNR	HO	𝐻diff	cSNR
CP	0.728±0.172	26.609±4.351	36.358±8.265	—
REC	0.730±0.146	26.820±3.819	35.920±6.809	8.182±0.735
REC-FC (third-width)	2.164±0.388	6.699±3.258	36.500±5.551	14.200±0.564
eREC-FC	1.806±0.301	10.307±3.653	48.590±7.496	10.361±0.771
eREC-FC and median filtering	2.192±0.405	6.366±3.567	58.334±8.923	9.898±0.741
eREC-FC and Lee filtering	2.296±0.401	5.665±3.347	57.477±8.563	9.934±0.724
eREC-FC and HMA filtering	2.214±0.352	6.335±3.073	56.950±8.070	9.873±0.712
eREC-FC and geometric filtering	2.154±0.363	6.962±3.099	50.248±7.148	11.027±0.647
eREC-FC and SRAD filtering	2.328±0.454	5.167±3.170	58.866±9.649	17.338±0.480
𝑃 value	2.252×10^−77	3.900×10^−105	2.482×10^−047	1.922×10^−142

1The values in the table are described in terms of the mean plus/minus one standard deviation.
2CP: conventional pulsing; REC: resolution enhancement compression; FC: frequency compounding; eREC-FC: enhanced REC-FC; HMA: homogeneous mask area filtering; SRAD: speckle-reducing anisotropic diffusion.